Add TPSWarpUtils

SpigotCore_Main/src/de/steamwar/core/TPSWarpUtils.java

@@ -0,0 +1,58 @@
+/*
+ *   This file is a part of the SteamWar software.
+ *
+ *   Copyright (C) 2023  SteamWar.de-Serverteam
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Affero General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU Affero General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.core;
+
+import com.comphenix.tinyprotocol.Reflection;
+import de.steamwar.core.Core;
+import lombok.experimental.UtilityClass;
+import org.bukkit.Bukkit;
+import org.bukkit.scheduler.BukkitTask;
+
+import java.util.function.LongSupplier;
+
+@UtilityClass
+public class TPSWarpUtils {
+
+    private static long nanoOffset = 0;
+    private static long nanoDOffset = 0;
+    private static BukkitTask bukkitTask = null;
+
+    static {
+        Class clazz = Reflection.getClass(Core.getVersion() <= 15 ? "{nms}.SystemUtils" : "net.minecraft.SystemUtils");
+        Reflection.FieldAccessor<LongSupplier> fieldAccessor = Reflection.getField(clazz, LongSupplier.class, 0);
+        fieldAccessor.set(clazz, (LongSupplier) () -> System.nanoTime() + nanoDOffset);
+    }
+
+    public static void warp(double tps) {
+        double d = 50 - (50 / (tps / 20.0));
+        nanoDOffset = Math.max(0, (long) (d * 1000000));
+        if (nanoDOffset == 0) {
+            if (bukkitTask == null) return;
+            bukkitTask.cancel();
+            bukkitTask = null;
+        } else if (bukkitTask == null) {
+            bukkitTask = Bukkit.getScheduler().runTaskTimer(Core.getInstance(), () -> nanoOffset += nanoDOffset, 1, 1);
+        }
+    }
+
+    public static boolean isWarping() {
+        return nanoDOffset > 0;
+    }
+}